code: def test_threshold_connect_components():
      a = np.zeros((10, 10))
      a[0, 0] = 1
      a[3, 4] = 1
      a = threshold_connect_components(a, 2)
      assert np.all(a == 0)
      a[0, 0:3] = 1
      b = threshold_connect_components(a, 2)
      assert np.all(a == b)
  
file_path: nipy/nipy/labs/tests/test_mask.py
imports: import nibabel
  import numpy
  from nipy.testing import anatfile, assert_array_equal
  from ..None import mask
  from ..mask import largest_cc, series_from_mask, threshold_connect_components
label_desc: Use image node_id 2 for calling a global function with example usage: test_threshold_connect_components() without return types